Of Warm Gas and Galaxy Mergers: Collisions Between Galaxies Can Halt Star Formation, According to New Study

A composite image of the gravitationally interacting galaxies NGC 3226 (at the top) and NGC 3227 (bottom), which clearly shows the tidally generated large structures that surround them as a result of a past collision with a third galaxy. Optical wavelengths in the image are shown in gray scale. The infrared glow of […]

Hubble Observes the 'Ghost Light' of Orphaned Stars Inside Galaxy Cluster

The massive galaxy cluster Abell 2744 takes on a ghostly look in this view by the Hubble Space Telescope, where the total starlight from the cluster has been artificially colored blue. This reveals that not all the starlight is contained within the galaxies, which appear as bright blue-white blobs in the image. A […]